A variable control pump and hydraulic system
A variable control and variable technology, applied in the field of variable control pumps and hydraulic systems, can solve problems affecting service life, prime mover overload, engine flameout, etc., and achieve the effects of prolonging service life, fast response and simple structure
Active Publication Date: 2020-11-03
WEICHAI POWER CO LTD +1
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Problems solved by technology
When the variable pump is under large displacement and heavy load at the same time, if the variable pump cannot respond and adjust in time, the required power of the variable pump may be greater than the maximum power of the prime mover, overloading the prime mover, causing the engine to stall or the motor to burn out, affecting the service life
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[0042] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only the technical solutions of the present invention. Some, but not all, embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.
[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct...
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The invention belongs to the hydraulic technical field, and discloses a variable control pump and a hydraulic system. The variable control pump comprises a main pump, a transmission assembly and a piloted variable oil cylinder. One end of the transmission assembly is connected to an inclined disc of the main pump. The piloted variable oil cylinder is connected to the other end of the transmissionassembly, hydraulic oil in the piloted variable oil cylinder drives the inclined disc of the main pump to move through the transmission assembly, each of the two sides of the piloted variable oil cylinder is provided with at least two feedback springs, and the number of the feedback springs on each side of the piloted variable oil cylinder is the same. A port P of the main pump communicates with one side of the piloted variable oil cylinder, a port S of the main pump communicates with the other side of the piloted variable oil cylinder, and accordingly the displacement of the main pump is adjusted through the pressure of the main pump. According to the variable control pump, prime motor overloading cannot be caused, the situation of engine flameout or motor burnout is reduced, and the function of prime motor protection is achieved; and the response speed is higher, additional arrangement of electric control elements, sensors and the like is not needed, the structure is simple, and achieving is easy.
Description
technical field [0001] The invention relates to the field of hydraulic technology, in particular to a variable variable control pump and a hydraulic system. Background technique [0002] The hydraulic pump is driven by a prime mover, which sucks in hydraulic oil from the oil tank or the low-pressure side pipeline of the pump, forms pressurized oil and discharges it to the actuator, where the prime mover specifically refers to the engine or motor. Hydraulic pumps are used as power components. According to whether the displacement can be adjusted, hydraulic pumps are specifically divided into quantitative pumps and variable pumps. [0003] The pressure of the existing variable pump depends on the load, the displacement of the variable pump depends on the control current, and there is no mechanical necessary connection between the pressure and the displacement of the variable pump. Existing variable pumps only have the function of electric proportional control, without the fun...
Claims
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IPC IPC(8): F04B1/20F04B1/324
Inventor 赵华李海军张立彬王国佐
Owner WEICHAI POWER CO LTD